Yui Kanakura

Yui Kanakura (奏倉 羽, Kanakura Yui) is a childhood friend of Raku Ichijō as well as his homeroom teacher for at least two trimesters starting from the second year. Yui is also the head of the Chinese mafia group, Char Siu (Chinese: 叉燒, Chāshāo). Yui is also in possession of a fourth key but has confirmed to Raku that she is not the girl he had made a promise with ten years prior.